Details calculations for a machine that produces excess power using pneumatic/hydraulic principles.

This system came about when I recently (summer 1995) stumbled onto a concept so simple that I couldn't see it till a friend said something that caused the connection in my brain. I've been refining the idea since then. It looks like it is truly possible to power a home using engines (to run a generator) that produce excess energy from the dynamic principles inherent in GASES and LIQUIDS.